expr-eval

This package is no longer maintained. Please use a-calc instead — a modern and actively maintained alternative for math expression evaluation and precision arithmetic.

Migration

npm install a-calc

a-calc Basic Usage

A powerful library for precision arithmetic and number formatting in JavaScript/TypeScript.

Install

npm install a-calc

Precision Arithmetic

import { calc } from "a-calc";

calc("0.1 + 0.2");          // "0.3"
calc("a + b", { a: 1, b: 2 }); // "3"

Formatting

calc("1234567 | ,");        // "1,234,567"
calc("1234567 | =2,");      // "1,234,567.00"
calc("1234567 | !c");       // "1.23M"

import { fmt } from "a-calc";
fmt(1234567, "=2,");        // "1,234,567.00"

Chain API

import { cadd } from "a-calc";

cadd(100, 200, 300)();          // "600"
cadd(1000, 2000)("=2,");       // "3,000.00"

Aggregation

import { calc_sum, calc_avg } from "a-calc";

calc_sum("price", [{ price: 10 }, { price: 20 }]); // "30"
calc_avg("score", [{ score: 80 }, { score: 90 }]); // "85"

Standalone Arithmetic

import { add, mul } from "a-calc";

add(0.1, 0.2); // 0.3
mul(3, 4, 5);  // 60

For the full API reference, visit https://a-calc.vercel.app/.